I wanted to move the axle vents up off the axles to higher ground for water crossings.   I found that the front axle and what I believe is the transmission breathers are mounted on the drivers side fender, already up pretty high.   The main problem was the rear axle vent.   I found that you could get a fitting from Nissan that would replace the stock vent, so I ordered one and got started.
Here are the front axle and what I believe is the transmission breathers on the front fender.

This is what the stock vent looks like next to the new breather fitting.

 

The Nissan part number is: 38323-C6010  Described as a Breather Connector, cost: $2.93

I removed the vent and screwed the new fitting in.

I then attached a piece of hose to the fitting and ran it up toward the fuel door.

 

(1/4 inch hose)

I attached a fuel filter in line to keep the dust out.

I drilled a small hole and poked the end of the ture out through it.   When you go through water, you push a wave in front of you, so the fuel door should be high enough for now.   

In the future, I will relocate the hose and tie it into the air intake system at the front of the truck.  This will mean making a hose run inside the frame rail to the front... and I don't have time for that now!

Bottom line... cheap easy mod.

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